Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: qual é a data de entrada em serviço com o nome dos navios koningin wilhelmina
 ###Tabelas: CREATE TABLE ships_operated_by_zeeland_steamship_company_smz (ships_operated_by_zeeland_steamship_company_smz_id AUTO_INCREMENT PRIMARY KEY, Ships name VARCHAR, Date entered service VARCHAR, Date withdrawn VARCHAR, Tonnage INT, Type of Ship VARCHAR) CREATE TABLE shipyards_in_the_program (shipyards_in_the_program_id AUTO_INCREMENT PRIMARY KEY, Yard Name VARCHAR, Location (City, State) VARCHAR, 1st Ship Delivery Date VARCHAR, Ship Types Delivered VARCHAR, Total Number of Ways VARCHAR) CREATE TABLE results_of_the_national_championships_-_1980_to_1995 (results_of_the_national_championships_-_1980_to_1995_id AUTO_INCREMENT PRIMARY KEY, Year INT, Venue VARCHAR, Men's Open VARCHAR, Women's Open VARCHAR, Men's 35s VARCHAR) CREATE TABLE winfield_triple_challenge (winfield_triple_challenge_id AUTO_INCREMENT PRIMARY KEY, Driver VARCHAR, Race 1 INT, Race 2 VARCHAR, Race 3 VARCHAR, Points INT) CREATE TABLE list_of_recent_northumberland_cup_winners (list_of_recent_northumberland_cup_winners_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Northumberland Senior Cup VARCHAR, Northumberland Senior Benevolent Bowl VARCHAR, Northumberland Minor Cup VARCHAR, Northumberland Women's Cup VARCHAR)  
SELECT Date entered service FROM ships_operated_by_zeeland_steamship_company_smz WHERE Ships name = Koningin Wilhelmina